/**
 * Copyright (c) 2012, Ben Fortuna
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  o Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 *  o Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 *  o Neither the name of Ben Fortuna nor the names of any other contributors
 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.mnode.newsagent.jcr

import org.apache.jackrabbit.util.Text;
import org.mnode.newsagent.TagCallback

class JcrTagCallback extends AbstractJcrCallback implements TagCallback {
    
    private javax.jcr.Node currentTagNode

    public void tagStart(String tag, String label) {
        node.session.withLock(sessionLock) {
            if (!currentTagNode) {
                currentTagNode = node << 'mn:tags'
            }
            currentTagNode = currentTagNode << Text.escapeIllegalJcrChars(tag)
            currentTagNode.addMixin('mix:referenceable')
            currentTagNode['mn:label'] = label
            save()
        }
    }

    public void tagEnd(String tag) {
        if (currentTagNode.parent.isSame(node)) {
            currentTagNode = null
        }
        else {
            currentTagNode = currentTagNode.parent
        }
    }

    public void feed(Object feed) {
        if (currentTagNode) {
            node.session.withLock(sessionLock) {
                if (feed['mn:tag']) {
                    feed['mn:tag'] << currentTagNode
                }
                else {
                    feed['mn:tag'] = currentTagNode
                }
                save()
            }
        }
    }

}
